Spencer Load Control Safety Switch - Manual (Page 2)

The Spencer Turbine Company 600 Day Hill Road Windsor, CT 06095-4706 TEL 800-232-4321 ◆ 860-688-8361 ◆ FAX 860-688-0098
I. Overview
The Load Control Safety Switch (LCSS) will monitor the current
load (amps) of a blower or vacuum producer to protect against
low load or overload operation. The lower portion of the panel is
divided into three categories: Display, Function, and Program.
The Display group has an Amps/SCFM LED (Light Emitting
Diode) that is linked to the 4-digit digital display (11) indicating
the “units” of the numerical value being displayed. The Display
group also has an LED indicator for System Ready that will illu-
minate to indicate that the start-up bypass time has expired and
that the LCSS is providing machine protection. The Function
group acts as a status indicator for alarm indication. Finally, the
Program group contains push buttons that allow the user to
interface with the controller.
The LCSS is programmed at Spencer with machine-specific
data, allowing for more precise control of a machine and con-
troller “matched set” configuration. The Amps/SCFM ratio will
therefore be tailored to the blower or vacuum producer perfor-
mance as determined by factory testing.
II. Applying Power
When power is applied to the LCSS Universal Controller, an
initialization sequence takes place. The controller’s 4-digit display
will indicate: 8.8.8.8. followed by 0000, 1111, 2222, 3333, ........
9999, SPENCER LCSS. When the initialization sequence is
complete, the Amps/SCFM LED (3) will light to indicate that the
digital display is in the amps mode. The blower or vacuum
producer may now be started by pressing the “start” button on
the control panel. The System Ready LED (4) will flash for 5
seconds (the start-up time delay that is programmed at Spencer)
and then remain lit, indicating that load control protection has
been enabled for normal operation. When the motor starts, the
motor current can be seen on the 4-digit digital display (11). By
pressing the Display button “D” (9), the digital display may be
changed from “Amps” to “SCFM” and vice versa.
Note: In SCFM mode, the “Amps/SCFM” LED (3) will be off.
III. Set Points
The LCSS Universal Controller has two set points, one for
Low Load and one for Overload. Only the Low Load set point
is field programmable. The Overload set point is programmed
by Spencer at between 1 and 1.15 times the Full Load Amp
(FLA) rating of the motor (depending on the service factor of
the supplied motor).
Low Load:
The Low Load set point can be adjusted by pressing the lower
Set button (6). The Low Load LED (5) will illuminate and the
digital display (11) will show the Low Load set point in amps
with the tenths digit flashing. To change the tenths digit in the
set point, press the Up button (10) or the Down button (7). To
change to the units digit, press the Display button “D” (9) and
the units digit will flash. Now press the Up button (10) or the
Down button (7) to change the set point. Pressing the “D” button
(9) shifts the numerical place value to the left, allowing for a
quicker change. To save the new set point and return to the
Amps or SCFM Display (normal operation), press the
Reset/Enter “R/E” button (8).
Overload:
The Overload set point can be viewed by pressing the upper
Set button (12). The Overload LED (2) will illuminate and the
digital display (11) will show the Overload set point in amps with
all the digits flashing. To exit and return to the Amps display
(normal operation), press the Reset/Enter “R/E” button (8).
Note: If either “Set” button is pressed and no operator
intervention occurs for 30 seconds, the controller will
switch back to normal operation. (The controller will revert
to the last operating display: Amps or SCFM.)
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2
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4 5 6
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8
9
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11
12
Load Control
Safety Switch
DISPLAY
AMPS/
SCFM
SYSTEM
READY
FUNCTION
OVERLOAD
LOW
LOAD
PROGRAM
SET D
SET R/E
▲
▼
11
10
9
8
7
6 5 4
3
2
1
12
1. Keypad Identifier
2. Overload LED
(OFF = Normal, Flash = Warning, ON = Shutdown)
3. Amps/SCFM Display LED
(OFF = Display reads SCFM, ON = Display reads Amps)
4. System Ready LED (OFF = Startup, ON = Enable)
5. Low Load LED
(OFF = Normal, Flash = Warning, ON = Shutdown)
6. Low Load “Set” Button
7. “Scroll Down” Button
8. Reset/Enter Set Points
9. Display Select Button
10. “Scroll Up” Button
11. 4-Digit Digital Display (7 Segment LED)
12. Overload “Set” Button